<template>
  <div id="app">
    <div>
      <headerVue></headerVue>
      <navigationVue></navigationVue>
      <div v-show="false" ref="car">
        <CartVue></CartVue>
      </div>
    </div>
    <router-view>
    </router-view>
  </div>
</template>
<script>
import headerVue from './components/header.vue';
import navigationVue from './components/navigation.vue';
import CartVue from './pages/Cart.vue';
export default {
  name: 'App',
  components:{
    headerVue,
    navigationVue,
    CartVue
  },
    //===========================下面是解决刷新页面丢失vuex数据
  created() {
    this.$refs.car.getCar();
    //在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem('store')) {
      this.$store.replaceState(Object.assign({}, this.$store.state, JSON.parse(sessionStorage.getItem('store'))));
    }
    //在页面刷新时将vuex里的信息保存到sessionStorage里
    window.addEventListener('beforeunload', () => {
      sessionStorage.setItem('store', JSON.stringify(this.$store.state));
    });
  }

}
</script>

<style>

</style>



